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It may be getting too hot and activating the safety shut off. This may need a new board. I have never worked on one of these but it has to be fixable. Depending on the cost of the unit as to whether or not it is worth it.

Check to make sure that the elements are weird in the right place.
See if there is any loose screws or metal on metal.
The elements might be bad
If wired wrong it may not be making a proper circuit.
Check the pcb boards to see if it is touching metal on the bottom side of board.
If you put a screw in the wrong spot it may be grounding something out.
Check all wires for bare spots

This is not going to work in your golf cart. This is propane based heater with a pilot light. It will go out if you drive because of the wind blowing on it. I also believe all Mr. Heaters have a tip hazard turn off. I know the two I have do. If you really want heat in your cart I would recommend an extra battery, an inverter and a porcelain electric heater. Could be made to work very nicely in your cart.

The troubleshooting manual says low fuel, low fuel and cold weather and kinked supply line. Beyond this I would need to know if something happened to the unit like it fell over or was taken apart.
Best,
Joe